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Neptune Outboard Motors



Neptune   Model Year Guide

1930 - 1940

(All models made by Muncie Gear Works)

Model Serial Description HP Cyl Notes
                              1930                         
OB2   Muncie Twin 2.5 2  
OB2A   Neptune Twin 2.5 2  
                              1931                         
OB2A   Junior Neptune 2.5 2  
OB2CB   Muncie Twin 2.5 2  
OB4A   Improved Neptune Twin 4 2  
OB15A   Neptune Master 16 2  
                              1932                         
OB3   Motorgo 4 2 Made for Sears  w/Motorgo label
OB3U   Motorgo Underwater Exaust 4 2 Made for Sears  w/Motorgo label
OB3A   Junior Neptune 4 2  
OB3AU   Junior Neptune Underwater Exaust 4 2  
OB3B   Muncie Twin 4 2  
OB3BU   Muncie Twin Underwater Exaust 4 2  
OB4A   Improved Twin 6 2  
OB15A   Neptune Master 16 2  
                              1933                         
OB4   Motorgo 4 4 2 Made for Sears  w/Waterwitch label
OB3U   Motorgo 4 Underwater Exaust 4 2 Made for Sears  w/Waterwitch label
OB4B   Muncie Twin 4 2  
OB4BU   Muncie Twin Underwater Exaust 4 2  
OB3A   Junior Neptune 4 2  
OB31A   Junior Neptune 4 2  
OB4A   Improved Twin 6 2  
OB15A   Neptune Master 16 2  
                              1934                         
OB5   Motorgo 5 4 2 Made for Sears  w/Waterwitch label
OB5U   Motorgo 5 Underwater Exaust 4 2 Made for Sears  w/Waterwitch label
OB31A   Junior Neptune 4 2  
OB61A   Improved Twin 6 2  
OB15   Motorgo 16 16 2 Made for Sears  w/Waterwitch label
OB15A   Neptune Master 16 2  
OB15B   Muncie Master 16 2  
                              1935                         
OB1   Neptune Single 2 1 Made for Sears  w/Waterwitch label
OB32A   Junior Neptune 4 2  
OB63   Improved Twin 6 2  
OB16A   Neptune Master 16 2  
                              1936                         
OB11   Neptune Single 2 1  
OB34   Junior Neptune 4 2  
OB64   Improved Twin 6 2  
OB16A   Neptune Master 16 2  
                              1937                         
OB12   Neptune Single 2 1  
OB12A   Neptune Single 2 1  
OB35   Neptune Single 4 2  
OB35A   Neptune Single 4 2  
OB65   Improved Twin 6 2  
OB65A   Improved Twin 6 2  
OB17   Master Twin 16 2  
OB17A   Master Twin 16 2  
                              1938                         
1A38   Junior Single 1.2 1  
1B38   Junior Single 1.2 1  
1C38   Junior Single 1.2 1  
2A38   Neptune Single 2 1  
2B38   Neptune Single 2 1  
2C38   Neptune Single 2 1  
4A38   Neptune Junior 4 2  
4B38   Neptune Junior 4 2  
6A38   Improved Twin 6 2  
6B38   Improved Twin 6 2  
9A38   Neptune 9 9 2  
9B38   Neptune 9 9 2  
16A38   Master Twin 16 2  
16B38   Master Twin 16 2  
                              1939                         
1A39   Junior Single 1.2 1  
1B39   Junior Single 1.2 1  
2A39   Neptune Single 2 1  
2B39   Neptune Single 2 1  
2C39   Neptune Single 2 1  
4A39   Junior Twin 4 2  
4B39   Junior Twin 4 2  
4C39   Junior Twin 4 2  
5A39   Twin 5 2  
5B39   Twin 5 2  
6A39   Improved Twin 6 2  
6B39   Improved Twin 6 2  
9A39   Neptune 9 9 2  
9B39   Neptune 9 9 2  
16A39   Master Twin 16 2  
16B39   Master Twin 16 2  
                              1940                         
10A1   Junior Single 1.2 1  
10B1   Junior Single 1.2 1  
10C1   Junior Single 1.2 1  
10A2   Neptune Single 2 1  
10B2   Neptune Single 2 1  
10A4   Junior Twin 4 2  
10B4   Junior Twin 4 2  
10A6   Improved Twin 6 2  
10B6   Improved Twin 6 2  
10A10   Neptune 9 9.5 2  
10B10   Neptune 9 9.5 2  
10A16   Master Twin 16 2  
10B16   Master Twin 16 2  

Model Number Codes:
 
There was a loose code of letters and numbers used to identify the early "Muncie Gear" outboard models.
 
Prefix OB = Outboard
Suffix First Letter (no letter) = Was labeled Private Brand like Motorgo, Sea King, etc.  example: OB3
Suffix First Letter (A) = Was labeled Neptune  example: OB3A
Suffix First Letter (B or C) = Was labeled Muncie  example: OB3B
Suffix Second Letter (U) = Underwater Exaust  example: OB3AU
In the early 40's:  A = Standard Model   AA = Deluxe Model w/ Rewind and Hood
Through the years the numerical number would identify horsepower and year of manufacture.


Neptune   Model Year Guide

1930 - 1940       1941 - 1971      1972 - 1987




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Last Modified: 4/24/04